છોકરાના ખેલ નથી. — chhokarana khela nathi

છોકરાના ખેલ નથી.

chōkarānā khēla nathī.

Literally: It is not child's play.
What it means: Said of a serious or complex task that demands maturity and real capability.

Also said as

ગુજરાતી કહેવતસંગ્રહ (Gujarati Kahevat Sangrah) (1921) · read from the scan by machine — the Gujarati itself is unchecked · English is machine-made and nobody has checked it yet

Heard it differently, or know we've got the sense wrong? Tell us — that is exactly the kind of correction this needs.